Improvement in the manner of forming the ribs of saw-gins for ginning cotton



E. CARVER.

Cotton-Gin Rib.

N0. 777. Patented June 12,1838.

; which have heretofore been employed.

places of the saws.

' still further advantage.

UNITED STATES,

PATENT OFFICE.

ELEAZER CARVER, OFBRIDGEWVATER, MASSACHUSETTS.

IMPROVEMENT IN THE MANNER 0F FORMING THE RIBS 0F SAW-GINS FOR GINNING COTTON;

Specification forming part of Letters Patent No. 777; dated June 12, 1838.

T 0 all whom it may concern Be it known that I, ELEAZER CARVER, of Bridgewater, in the county of Plymouth and Commonwealth of Massachusetts, have invented certain Improvements in the Manner of Forming the Ribs of Saw-Gins-for the Ginning of Cotton; and I do hereby declare that the following is a full and exact description thereof.

The cylinder of saws and the other parts of the saw-gin may be constructed in the usual manner; but I construct the ribs which form the grating through which the saws work in a form different in several respects from those In the accompanying drawings, Figure l is a representation in perspective of one of the ribs of the form generally given to it by me. Fig."2 shows four ribs in their cross-section, and Fig. 3, four ribs standing in front of the saw-cylinder, and having the saws between them. Y

The saws are shown in Fig. l by the dotted lines A, and by the lines A A A in Fig. 3. The dotted lines a b c in Fig. 2 also show the I denominate the curvature given by me to the ribs, as shown at C, Fig. 1, the lower curve, and that commencing at D the u'pper? curve.

Instead of making the upper sides of the ribs with a flat surface, as is usually done, I form them' ridge-shaped, as shown in Fig. 1, and more distinctly in the cross-sections,

- Fig. 2.

formed grate bars or ribs is, that from their lateral inclination they give the seeds a direction toward the saws, so that they may with the greater certaintybe caught and drawn up by the teeth so long as any fiber remains upon them. The upper curve, D, is the part through which the cotton is drawn as it is separated from the seeds; and in this part, along which the ridge is continued,it has a The obtuse angle which the inclined ridge forms with the side of the rib prevents the cutting or breaking of the fiber as the cotton is drawn through, while it also forms a channel that prevents the seedcotton from escaping in a lateral di ments made by me, to form the rib in such amanneras that the portion of the circumference of the saw which is between the ribsthat is to say, from the point at which the cotton is first drawn in to that at which it escapes from between them-shall be equal to the full length of the fiber of the cotton to be ginncd. The projection F extends nearly across the ribs, and its rise is such as to admit the seed-cotton to slide over it at the same time that the teeth are drawing the fibers through the spaces between them, which spaces are sufficiently wide to admit of the passing of the smaller seeds of cotton, which seeds are arrested, drawn up, and carried off at C. Above the point E, where the saw escapes, the rib slopesor narrows toward C, which allows the smaller seeds which may be arrested at D to pass out freely at Having thus fully described the construction of the grate bars or ribs of my cottongin, I claim as constituting my improvements The ridge form given to their upper surfaces, in the manner and for the purposes set forththat is to say, to give an inclination of the seeds toward the saws, and to prevent the breaking or cutting of the fibjer in consequence of the obtuseness of ,the angle against which it is'drawn 011; also, the oblique projection F, to give a larger space for the filling of the sawteeth with cotton; likewise the slope given to the ribs at C, where the cotton is drawn in, thereby increasing it in width, and allowing the seeds to escape to prevent the grates from being choked, the whole combined and arranged as herein set forth.

ELEAZER CARVER.

The point E is that 

